Tunnelling and Underground Space Technology最新文献_第5页

Geo-mechanical model test on synergistic seepage control in a deeply buried water diversion tunnel under hydro-mechanical coupling conditions

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology

Pub Date : 2025-02-24 DOI: 10.1016/j.tust.2025.106516

Pengfei Wang , Qiangyong Zhang , Kang Duan , Hanxiang Lin

Deeply buried water diversion tunnels frequently traverse regions with high seepage pressure and face numerous issues related to seepage. Therefore, implementing effective seepage control measures is critical. The main seepage control modes in modern tunnel engineering are the full blocking mode and the limited discharge mode. To investigate the impact of different seepage control modes on the seepage field, stress field, and displacement field and to reveal the synergistic seepage control effects among the tunnel’s structures under the limited discharge mode, this study conducts a model test using a self-developed three-dimensional hydro-mechanical coupling model testing system. Based on the engineering conditions of the Xiang-Lu Mountain tunnel, the test simulates tunnel excavation, support, and seepage drainage, successfully achieving the transition of seepage control mode from the full blocking mode to the limited discharge mode. For the tested conditions, the test results indicate that pre-excavation grouted reinforcement effectively mitigates the impact of excavation disturbances on the rock mass. The seepage pressure load on the lining in the limited discharge mode can decrease by up to 20%-25%. Grouted reinforcement and drainage holes effectively lower the seepage pressure load on the lining structure, although their influence on the seepage field diminishes with increasing distance from the tunnel. Under the limited discharge mode, a beneficial synergistic seepage control system is established within the tunnel, where the lining provides secondary support while the surrounding rock and grouted reinforcement area bear the primary load.

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引用次数: 0

Optimal intensity measures for fragility analysis of shallow circular subway tunnels subjected to Rayleigh waves

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology

Pub Date : 2025-02-24 DOI: 10.1016/j.tust.2025.106478

Ji Zhang , Hengyi Li , Chenyu Yan , Zigang Xu , Haiyang Zhuang , Baizan Tang , Guobo Wang

Shallow subway tunnels in both the intermediate and far fields are significantly affected by Rayleigh surface waves, which typically induce substantial vertical seismic motion and exhibit high seismic destructiveness. However, current vulnerability assessments of underground tunnels primarily focus on body waves. This study aims to identify the optimal ground motion intensity measures (IMs) for evaluating the seismic fragility of shallow circular subway tunnels subjected to Rayleigh waves. A detailed dynamic analysis of soil-tunnel interaction is performed using the two-dimensional Finite Element Method, with particular emphasis on the influence of tunnel burial depth and site classification on the tunnel’s response to Rayleigh waves. The input of Rayleigh wave motion is modeled by transforming the motion into a series of equivalent forces, applied through viscoelastic boundaries. This study examines 15 widely used ground motion IMs, with diameter deformation ratio (DDR) serving as the damage measure (DM). Linear regression analysis is conducted to explore the relationship between IMs and DDR. The optimal IMs are evaluated based on criteria including efficiency, practicality, proficiency, and correlation. The results indicate that for sites classified as Class III and IV, the optimal IM is root mean square velocity (v_rms), while for Class II sites, spectral mean velocity (SMV) is more suitable. Fragility curves for shallow-buried tunnels in Class II, III, and IV sites are presented. These curves demonstrate that tunnels are most vulnerable to damage in Class II sites, followed by Class IV, and least vulnerable in Class III sites. In Class II sites, shallower tunnel depths are associated with increased seismic damage, while deeper tunnels in Class III and IV sites experience greater seismic damage. The primary factor influencing seismic damage to tunnels is the vertical relative deformation of the surrounding soil layers.

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引用次数: 0

A multi-factor CFD simulation to dust suppression in dynamic tunnel excavation

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology

Pub Date : 2025-02-24 DOI: 10.1016/j.tust.2025.106458

Cheng-Yan Wang , Hui Zhang , Tao Xue , Le Fang

This study investigates dust suppression in mining tunnels using a multi-factor simulation framework, advancing beyond traditional single-method approaches. We integrated dynamic roadheader operations, belt conveyor transport, onboard spraying, wet scrubbers, water curtain filtration, and drainage channels within Computational Fluid Dynamics (CFD). User-Defined Functions (UDFs) were employed to simulate dust suppression processes by spray and water curtains. On-site experiments were conducted alongside CFD simulations to validate the effectiveness of the combined measures. Results indicate that the integrated dust suppression strategies are significantly more effective than the standalone onboard dust suppression system. Activating sequential water curtains and spray systems reduced dust concentrations by up to 80.4% in key tunnel sections, with notable reductions in high dust concentration areas. This multi-factor approach effectively stabilized airflow, reduced dust dispersion, and prevented the formation of large dust clouds, creating a safer and healthier work environment.

{"title":"A multi-factor CFD simulation to dust suppression in dynamic tunnel excavation","authors":"Cheng-Yan Wang , Hui Zhang , Tao Xue , Le Fang","doi":"10.1016/j.tust.2025.106458","DOIUrl":"10.1016/j.tust.2025.106458","url":null,"abstract":"<div><div>This study investigates dust suppression in mining tunnels using a multi-factor simulation framework, advancing beyond traditional single-method approaches. We integrated dynamic roadheader operations, belt conveyor transport, onboard spraying, wet scrubbers, water curtain filtration, and drainage channels within Computational Fluid Dynamics (CFD). User-Defined Functions (UDFs) were employed to simulate dust suppression processes by spray and water curtains. On-site experiments were conducted alongside CFD simulations to validate the effectiveness of the combined measures. Results indicate that the integrated dust suppression strategies are significantly more effective than the standalone onboard dust suppression system. Activating sequential water curtains and spray systems reduced dust concentrations by up to 80.4% in key tunnel sections, with notable reductions in high dust concentration areas. This multi-factor approach effectively stabilized airflow, reduced dust dispersion, and prevented the formation of large dust clouds, creating a safer and healthier work environment.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"159 ","pages":"Article 106458"},"PeriodicalIF":6.7,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical performances of the pipe-liner structure under void conditions

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology

Pub Date : 2025-02-22 DOI: 10.1016/j.tust.2025.106484

Kangjian Yang , Jianwei Zhang , Hongyuan Fang , Shaochun Ma , Lei Shi , Bin Li , Yizhuang Lou , Kuoyu Yang , Kejie Zhai

Voids still commonly exist around the pipeline after cured-in-place-pipe (CIPP) rehabilitation, posing a serious threat to the safe operation of the pipeline. However, current research primarily focuses on the improvement and performance evaluation of CIPP rehabilitation technology, with insufficient exploration of the impact of external voids on the pipe-liner structure. To address the aforementioned issues, this paper utilizes both full-scale tests and numerical simulations to investigate the mechanical performances of pipe-liner structures under void conditions by analyzing the effects of the void angle, depth and length on the stress state, differential displacement, relative rotation and bending moment of the pipe-liner structure. In addition, corresponding repair strategies were explored to provide practical solutions for addressing surrounding voids of the pipe. The results show that voids can reduce the interaction force between the pipe and the surrounding soil, alter the stress state of the pipe-liner structure, increase the vertical displacement and relative rotation of the pipe, and sharply increase the stress in the CIPP liner at pipe joints, with the effects becoming more pronounced as the void depth, angle, and length increase. Polymer grouting can effectively fill the voids around the pipeline, enhance the service performance of the pipeline, and provide an effective strategy for eliminating the effects of voids around the pipe.

{"title":"Mechanical performances of the pipe-liner structure under void conditions","authors":"Kangjian Yang , Jianwei Zhang , Hongyuan Fang , Shaochun Ma , Lei Shi , Bin Li , Yizhuang Lou , Kuoyu Yang , Kejie Zhai","doi":"10.1016/j.tust.2025.106484","DOIUrl":"10.1016/j.tust.2025.106484","url":null,"abstract":"<div><div>Voids still commonly exist around the pipeline after cured-in-place-pipe (CIPP) rehabilitation, posing a serious threat to the safe operation of the pipeline. However, current research primarily focuses on the improvement and performance evaluation of CIPP rehabilitation technology, with insufficient exploration of the impact of external voids on the pipe-liner structure. To address the aforementioned issues, this paper utilizes both full-scale tests and numerical simulations to investigate the mechanical performances of pipe-liner structures under void conditions by analyzing the effects of the void angle, depth and length on the stress state, differential displacement, relative rotation and bending moment of the pipe-liner structure. In addition, corresponding repair strategies were explored to provide practical solutions for addressing surrounding voids of the pipe. The results show that voids can reduce the interaction force between the pipe and the surrounding soil, alter the stress state of the pipe-liner structure, increase the vertical displacement and relative rotation of the pipe, and sharply increase the stress in the CIPP liner at pipe joints, with the effects becoming more pronounced as the void depth, angle, and length increase. Polymer grouting can effectively fill the voids around the pipeline, enhance the service performance of the pipeline, and provide an effective strategy for eliminating the effects of voids around the pipe.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"159 ","pages":"Article 106484"},"PeriodicalIF":6.7,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143463850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sustainability of underground infrastructure – Part 2: Digitalisation-based integration and optimisation for low carbon design

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology

Pub Date : 2025-02-21 DOI: 10.1016/j.tust.2025.106479

Xilin Chen , Mengqi Huang , Feng Xiao , Yu Bai , Qian-Bing Zhang

This paper integrates low-carbon strategies into conventional tunnel design practices, bridging the gap between traditional approaches and sustainable solutions. Geotechnical performance indicators and corresponding design parameters that influence embodied carbon are identified from preliminary considerations of support pressure in Convergence-confinement Methods (CCM) and detailed 3D numerical design of Tunnel Boring Machine (TBM) operation and machine-structure interaction. Low-carbon technologies in tunnelling in examples of worldwide projects are reviewed to provide benchmarks for industry practice. Using Building Information Modelling (BIM) as a centralised data platform that incorporates geomechanical properties and embodied carbon factors, multi-objective optimisation (MOO) is employed to balance decarbonisation and geo-structural performance of concrete lining, demonstrating significant carbon reduction potentials in Pareto optimal solutions. While strategies through adjustments to TBM operation and lining design can be further pursued in numerical simulation, the findings underscore the potential for realising low-carbon opportunities in tunnel design, particularly when ground conditions and other geo-structural factors are quantified early in the design process. The proposed workflow offers practical insights into the application of advanced design techniques, empowering engineers to make informed decisions that contribute to sustainable underground infrastructure development.

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引用次数: 0

Short-term metro passenger flow prediction based on hybrid spatiotemporal extraction and multi-feature fusion

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology

Pub Date : 2025-02-20 DOI: 10.1016/j.tust.2025.106491

Tao Wang , Jianjun Song , Jing Zhang , Junfang Tian , Jianjun Wu , Jianfeng Zheng

Accurate short-term passenger flow prediction in metro systems is essential for effective metro operation planning and passenger guidance. However, existing studies take OD information as reference of topological connection relationship, and neglect the real-time distribution trend of passenger flow. This oversight limits their ability to account for the impact of emergencies on passenger flow. Additionally, previous research has insufficiently addressed the bidirectional flow nature of passenger flow, leading to an incomplete capture of its features. To address these gaps, we propose a Hybrid Spatiotemporal Extraction and Multi-Feature Fusion (HSTE_MFF) model that considers both the bidirectional flow characteristics of metro passengers and real-time distribution trends. First, stations are treated as time units within a bidirectional long short-term memory (Bi-LSTM) neural network to aggregate passenger flow information. Then, a hybrid network framework, comprising Bi-LSTM, an improved residual structure (ResGAC), and LSTM, is designed to extract spatiotemporal features of passenger flow. Additionally, a multi-feature fusion algorithm is introduced to leverage the implicit passenger flow distribution characteristics found in OD data. Unlike previous algorithms, our approach uses historical inflow and outflow data to assess station passenger flow levels and employs the distribution trend of passenger flow at the origin as a weight for predicting future outbound passenger flow destinations. An empirical test using real data from the Qingdao metro system validated the model’s effectiveness. Comparative analysis with various baseline models demonstrated that the HSTE_MFF model significantly reduces prediction errors across different time intervals. Furthermore, a portability test with data from the Hangzhou metro system confirmed the model’s effectiveness in metro networks with different structural characteristics.

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引用次数: 0

Mechanical response of pile group and stratum induced by shallow tunneling based on the model test

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology

Pub Date : 2025-02-20 DOI: 10.1016/j.tust.2025.106480

Caixia Guo , Hongyu Yue , Yingying Tao , Gang Liu , Fanchao Kong , Dechun Lu , Xiuli Du

Taking a shield tunnel in the Beijing subway system as the background, a three-dimensional model test study is conducted on shield tunneling adjacent to the pile group. In this scaled model test, the geometric similarity ratio is designed as C_L = 1/24. This test reveals the evolution patterns of surface displacement and characteristic deformation of piles during shield tunneling. Two conditions are designed to monitor tunneling adjacent to unilateral and bilateral pile groups. During the tunnel excavation process, surface settlements, pile group displacements, and strains of the pile are observed. The measured results elucidate the stratum deformation patterns observed throughout the shield tunneling process, as well as the deformation characteristics of the existing pile groups in both the circumferential and longitudinal directions. This study compares the effects of existing a pile group versus a greenfield area during tunneling adjacent to a unilateral pile group, taking into account the sheltering effect of the pile group. Finally, the differences in impact from varying pile lengths and pile-tunnel spacings on surface settlements are analyzed, along with the influence of pile length on the vertical and horizontal displacements of the pile group.

{"title":"Mechanical response of pile group and stratum induced by shallow tunneling based on the model test","authors":"Caixia Guo , Hongyu Yue , Yingying Tao , Gang Liu , Fanchao Kong , Dechun Lu , Xiuli Du","doi":"10.1016/j.tust.2025.106480","DOIUrl":"10.1016/j.tust.2025.106480","url":null,"abstract":"<div><div>Taking a shield tunnel in the Beijing subway system as the background, a three-dimensional model test study is conducted on shield tunneling adjacent to the pile group. In this scaled model test, the geometric similarity ratio is designed as <em>C<sub>L</sub></em> = 1/24. This test reveals the evolution patterns of surface displacement and characteristic deformation of piles during shield tunneling. Two conditions are designed to monitor tunneling adjacent to unilateral and bilateral pile groups. During the tunnel excavation process, surface settlements, pile group displacements, and strains of the pile are observed. The measured results elucidate the stratum deformation patterns observed throughout the shield tunneling process, as well as the deformation characteristics of the existing pile groups in both the circumferential and longitudinal directions. This study compares the effects of existing a pile group versus a greenfield area during tunneling adjacent to a unilateral pile group, taking into account the sheltering effect of the pile group. Finally, the differences in impact from varying pile lengths and pile-tunnel spacings on surface settlements are analyzed, along with the influence of pile length on the vertical and horizontal displacements of the pile group.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"159 ","pages":"Article 106480"},"PeriodicalIF":6.7,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of the sound environment in a metro platform space based on audio-visual interaction experiments

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology

Pub Date : 2025-02-20 DOI: 10.1016/j.tust.2025.106476

Dongxu Zhang , Xinyi Chen , Xueliu Liu , Hao Chen , Xinyi Zhang , Fei Guo , Yingsheng Zheng

In response to rapid urban development in China, subways have become a key component of urban transportation systems. The audio-visual environment of the most commonly used subway platforms has a significant effect on the emotions and health of the vast population that relies on subway travel. Taking the typical subway station space in Guangzhou as an example, four types of representative sounds and scene images were examined in this study. Audio-visual interaction experiments were conducted in the laboratory to explore the effects of visual and spatial elements in metro platform spaces on evaluations of the acoustic environment. The study found significant differences in the direction and degree of influence of different visual factors on various acoustic evaluations in subway platform spaces. Under acoustic-only condition, background music received the highest scores in the acoustic comfort, preference. However, these scores significantly decreased after platform images were added, while the quietness evaluation for the train arrival and departure sounds, broadcast sounds, and crowd activity sounds improved. In terms of visual factors, the impact of spatial brightness on acoustic evaluations was significantly greater than that of cool and warm colour tones or the spaciousness of the metro platform. An increase in brightness can significantly improve the three acoustic evaluations of broadcast sounds. The influence of colour tones and spaciousness on the evaluation of different sound types varied greatly. When the platform’s scene changes from warm to cool tones, the comfort ratings for train arrival and departure sounds decreases significantly, whereas the quietness evaluations for broadcast sounds improve significantly. When the platform’s spaciousness is reduced, the quietness of crowd activity sounds significantly decreases. The impact of visual factors on the evaluation of the acoustic environment follows the order of quietness > comfort > preference. Among various sounds, visual factors had the most significant impact on the evaluation of broadcast sounds. These results provide a direction for future research in terms of exploring the interaction between visual scenes and specific sound sources in traffic spaces and its influence on acoustic evaluation mechanisms.

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引用次数: 0

Damage mechanism of tunnel base heave under interlayer weakening effect in nearly horizontal layered rock

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology

Pub Date : 2025-02-20 DOI: 10.1016/j.tust.2025.106439

Xingyu Zhu, Zhiqiang Zhang, Ying Feng, Hang Yu

The damage mechanisms and mechanical behavior of tunnel base heave in nearly horizontal layered rock were researched in this paper through three perspectives: causal analysis, mechanical analysis, and sensitivity analysis. Firstly, through field tests and laboratory experiments, it was found that the layered rock mass with structural planes being significantly weakened due to continuous groundwater infiltration, leading to heave deformation of the tunnel base subject to horizontal geostress. Then, the mechanical model for buckling instability of a layered rock structure was established to derive the deflection curve under interlayer load and the limit state buckling equations of the layered rock mass. Theoretical results indicate that the critical buckling instability load of layered rock masses is related to the horizontal stress and their structural and material characteristics, while the interlayer load influences the deformation before buckling. Meanwhile, by incorporating a discrete element numerical model employing the Bonded Block Model to represent the multi-layered structural planes, the interlayer load pattern and the base heave deformation were determined. Finally, the stability coefficients were calculated by using the critical buckling load equations for several typical cases of high-speed railway tunnels to identify the transition of the instability state of layered rock mass. The analysis of instability state of tunnel base and the sensitivity of influencing factor provides a reference for identifying and mitigating the base heave for the high-speed railway tunnel.

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引用次数: 0

A modified domain reduction method for analysing the 3D seismic response of long tunnels

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology

Pub Date : 2025-02-19 DOI: 10.1016/j.tust.2025.106461

Swetha Veeraraghavan, Bhavesh Banjare

Tunnels located close to earthquake faults have been damaged during recent earthquakes, and the damage patterns suggest a complex 3D response of the tunnel in these zones. The domain reduction method (DRM) is a computationally efficient finite element method widely used to analyse the response of finite structures to wavefields generated through earthquake fault rupture simulations. However, this method does not work for simulating the seismic response of infinitely long tunnels. In this work, we modify DRM to accommodate infinitely long tunnels. We verify the accuracy of the modification for a wide range of parameters by comparing the numerical solution with existing semi-analytical solutions for the 3D response of tunnels subject to seismic waves incident on the tunnel from arbitrary directions. The boundary effects resulting from the truncation of the soil domain for numerical modelling are also explored, and recommendations on the numerical domain dimensions to ensure accurate results are presented. This modified DRM would be a powerful tool for analysing the 3D seismic response of tunnels subjected to near-fault wavefields generated through earthquake fault rupture scenarios.

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引用次数: 0